Drill and underreamer



@ML M, 1924. WHMM J. C. STOKES DRILL AND UNDERREAMER Filed Aug. 17. 1920 2 Sheets-Sheet l 36 H- if? LEM 11 6M? J. C. STEJKES DRILL AND UNDERREAMER Filed Aug. 17. 1 920 2 Sheets+Sheet 2 a'vwewiioz @wtmm M w Fatented Uet. l i, iaaa aroma e. 's'ronas, or snnnvnroie'r, Louisiana.

DRILL AND "UNDERREAll/Imt.

application filed August 17,1920. Serial No. 404,240.

State of Louisiana, have invented certain' new and useful Improvements in Drills and Underreamers, of which the following is a specification.

This invention relates to drills and un-' derreamers and is an lmprovementon-my' Patent No. 1,379,483, issued May 24:, 1921, and on my Patent No. 1,360,328, issued November 30, 1920. a

The principal object of the invention is to provide an improved means of forming the fluid washing channels in the legs of the drill bit carrier, so that the same can be easily made therein and so that the debris will be effectively washed from 29 around the bit blades.-

lVith this and otherobjects in view, the invention consists in the novel construction, arrangement and formation of parts as will be hereinafter more specifically described, claimed and illustrated in the accompanying drawings, forming a part of this specification, in which drawings:

Figure 1 is a vertical longitudinal section through the improveddrill and underreamer showing the blades of the drill bit in operative position and a grapple or overshot in operative position for raising the drill bit and carrier from the drill holder and stem.

Figure 2 is an elevation of the grapple or overshot.

Figure 3 is a detail transverse section through the drill taken on the line 3-3 of Figure 1. rigure 4 is a .fra unentar vertical section through the drill bit carrier and grapple in operative position in relation .to each other illustrating the type of dogs utilized for lowering the drill bit and carrier into the stem and holder.

Figure 5 is a detail section taken on the line 5-5 of Figure 2.

Figure 6 is an enlarged elevation of the improved drill bit carrier. M0 Figure 7 is afvertical longitudinal section through the same taken on the line 7-7 of Figure t.

all

Figure 8 is .a fragmentary longitudinal section through the drill bit carrier taken on the line 8-8 of-Figure 6.

Figure 9 is a transverse section through the carrier taken on the line 9-9 of Figure 6. 4

Figure 10 is a similar section taken on the line 1010 of Figure 6. Referring to the i drawings in detail, wherein similar reference characters designate corresponding parts throughout the several views, the letter A generally indicatesthe improved drill which includes the holder or drill stem B, the bit carrier C, and the drill bit D and E, the

grapple or overshot.

The tool holder or drill stem B includes a cylindrical body 15 having an annular flange 16 formed on its inner surface adjacent to thelower end thereof, whichde fines the upper and lower shoulders 17 and 18 which are adapted to be engaged by the bit D when the same is in its extended operative position. The inner surface of the cylindrical body 15 below the shoulder 18 is gradually increased in. diameter toward its lower end as at 19, and this inclined portion is provided with one or more pairs of oppositely disposed longitudinally eX- tending ribs (not shown in the present drawings), and which are adapted to form stops for the bit D. The upper inner face of the cylindrical body 15 above the upper shoulder 17 is enlarged in diameter as at 21 which forms a shouldefwhich is ground to form an inclined; seat or bearing 22, the

purpose of which will be hereinafter more specifically described.

The bit carrier 0 comprises a solid body 23 of cylindrical formation whose diameter is substantially equal-to the internal diameter of the enlarged portion 21 of the bore of the hollow cylindrical body 15 and the lower endof the same is bevelled to form an annular face 24 which is adapted to fit on the seat or bearing face 22 so as to form a tight fit or seal between the bit holder B and the carrier C. This prevents the seeping of water by the drill bit carrier when the same is in its lowermost position. The lower end of the body 23 is notched as at 25 on its opposite sides so as to re- W ll ceive the depending bit carrier legs 26. The upper terminals of the legs 26 are'secured to the body 23 by bolts and nuts 27 and the nuts may be countersunk if so desired. The legs 26 are provided with water channels 28 for cleaning the bit blades D.

The arrangement and formation of the water channels 28 form an important part of the invention and it is to be noted that these channels extend from the upper terminals of the legs to the lower free ends thereof and the inner faces of the legs on one side of the longitudinal center thereof are provided with longitudinal grooves 29 and the upper ends of the legsare notched as at 30 which forms entrance ports for the water or other cleaning fluid. As clearly shown in Figure 6 of the drawings, the side walls of the slots 29 are gradually converged toward the free ends of the legs so that the cleaning 4 fluid will be placed under pressure when the same flows into engagement :Wlhll' the bit blades D. Tapered cover plates 31 are provided for the grooves 29 and these cover plates 31 extend from the lower edge of the body 23 to the lower edges of the legs 26 and these cover plates may be brazed. welded or otherwise secured to the side walls of the grooves and these cover plates are adapted to extend flush with the inner surfaces of the legs. As shown the opposite side walls of the grooves are dove-tailed as at 32 and the side edges of the cover plates are shaped accordingly and the same are adapted to be slid into position. The means for forming the water channels 28 in the legs 26 eliminates the necessity of boring the legs longitudinally and thus simplifies the making of these channels and it can be seen that when the cover plates 31 are connected to the legs as shown in the drawings the same can be readily removed when desired for permitting the thorough cleaning of the channels.

The covers 31 are provided intermediate their ends with openings 31'. These openings 31' are formed in the covers for a purpose which will be hereinafter more specifically described. 7

If so desired the bit carrier C directly belowthe inclined face 24 may be provided with any suitable type of piston rings 33 for frictional engagement with the inner face of the drill holder B so as to absolutely preclude the passage of the cleaning fluid between the drill holder andthe bit carrier C.

The bit D includes a pair of spaced plates, or blades 34 and 35. which have their outer edges provided with shoulders 36 and 37- for engaging the lower edge of the tool holdtherewith for a described. A raising and lowering (lP\';(P E. in the in their lowermost extended positions. The blades 34 and 35 are provided adjacent their inner edges with inclined slots 39 and the upper and lower ends of these slots may terminate in angular extensions 40. These slots 39 are adapted to receive the pivot pin 41 which is of special construction and this pin is carried by the lower terminals of the legs 26 of the bit carrier The upper angular straight extensions 40 of the slots are provided so as to permit the blades to be held in line and these angular extensions extend parallel. with the longitudinal medial lines of the blades. The purpose of the openings 31 inthe covers 31 of the legs 26 is to permit a certain portion of the fluid in the channels to pass in the slots 39 to keep them washed out, so that the pin 41 will have free movement therein. The pivot pin 41 is provided with an enlarged head 42 which is countersunk in one ofv the legs 26. while the opposite end of the pin is provided with a reduced threaded extension 43. The reduced threaded extension is threaded into the other leg 26 and the same forms a shoulder 44 which limits the insertion of the bolt into the leg 26 and prevents the squeezing of the legs into frictional contact with the bit blades D. The pin 41 is held in place against accidental displaccmcnt by means of a'cotter pin 45 and the outcr surface of the leg 26 can be grooved for receiving the same.

The upper end of the body 23 of the carrier C is provided, in the example shown. with an upwardly extending centrally die posed stem 46 which is provided with a. coni cal hcad 47 for a purpose which will hereinafter more fully appear. The stem 46 has slidablv mounted thereon the weight 43 which has its upper end tapered or rounded for a purpose which will also hereinafter more fullv appear. The weight 48 normally engages the upper surface of the body 25% of the carrier C and is adapted to engage the head 49 of a sliding rod 56 for normally holding the same downwardly in its bore 51 which extends longitudinally through the bodv 23 of the carrier C. When the bit. blades 34 and 35 reach the lower end of the holder C and are held against further downward movement.- the lower end of: the rod 50 will engage the blades and be forced upwardlv therewith and raise the weight 48 purpose which will now be example shown'is provided for facilitating the manipulation of the bit carrier-in the drill stem and the same includes the solid cylindrical body 52 the lower end of which is bifurcated as at 53 for the reception of a pair of dogs 54 and a pair of dogs 55. The

pairs of dogs 54 and are freely intnrchangeable and the dogs. 54 are utilized for hoisting the bit blades D and carrier C in 1 stem 46. The lower edges of the teeth 62' mimic the holder and stem and the dogs 55 are utilized for lowering thebit carrier and blades in the bit holder B. The upper end of the body 52 isprovided with a reduced. threaded extension 56 which receives the h0l-' are rounded as at 63 so that the dogs will be spread open on the pivot pin 61 when the teeth 62 engage the conical head 47. The teeth 62 are of such a shape as to be readily inserted between the weight 48 and the conical head 47. The upper terminals of the dogs '54: above the pivot pin 61 are provided with the right angularly extending legs 65 which normally tend, owing to the weight thereof, to hold the toothed ends of the dogs out of engagement with 'the conical head 4-? of the stem 46. The free terminals of the legs 65iextend beyond the sides of the body 52 for a purpose which will be hereinafter more specifically described.

' As's'tated the dogs 55. are adapted to be utilized when the bit carrier C is being 10wered into the bit holder and when the dogs are to be utilized instead of the dogs"54 the pin 61 is removedand the dogs 54 replaced by the dogs 55 and the pin61 is jil again replaced. The dogs 55 are of the same shape and operatein the same manner as the dogs 54twith the exception that the same are provided with. relatively high teeth 66 for engagement with the conical head 47 of the stem 46. These teeth havetheirlower faces also curved as at 67 and theyare formed relatively high so that when the weight 48 is raised by the rod 50 the same will be operated and forced away from the head 47 so as to permit the automatic releasing of the raising and lowering-device E.

from the carrier. The lower end of the carrier, at the bifurcation thereof, is also 'hollowed out and shaped as at 68 to conform to the configuration of the weight 48. If so de- I iutli tended terminalsof the legs of the dogs 54 and thereby swing the dogs on the pivot pins 61 and the teeth 62 thereof from out of engagement with the head 47. The raising and lowering device E can then be readily removed from the stem and other methods can bcthen pursued for removing the carrier from the bit holder.

Stop lugs 7 0' are carried by the opposite sides of the body 52 for limiting the downward movement of the shell70 on the hoisting and lowering device.

Changes in details may be made'without departing from the spirit or scope of this invention; but,

I claim 1. In a drill apparatus, a bit carrier including a body and spaced legs, the inner faces and upper edges of the legs being provided with grooves, and cover plates carried by the legs and enclosing said grooves.

2. In a drillapparatus, a bit carrier in-- .exten ing grooves and cover plates carried by the legs and enclosing said grooves from v said body to the terminals of said legs.

3. In a drill apparatus, a bit carrier including a cylindrical body and depending spaced legs, the inner faces of the legs being provided with longitudinally extending grooves and removable cover plates carried by :the legs and arranged to enclose said grooves.

4. In a drill apparatus, a bit carrier including a cylindrical body and-recesses formed in its opposite faces, depending legs having their upper terminals fitted in said recesses, the legs having their inner faces provided with longitudinally extending grooves extending from the upper ends of the legs, to the lower ends thereof and their upper edges with notches, and cover plates carried by the inner faces of said legs and 5. In a drill apparatus, a bit carrier-including a-cylindrical body having recesses formed in its opposite faces and depending spaced legs, the upper terminals of the legs beingv arranged in said recesses. the inner faces of said legs being provided with longitudinally extending grooves and their upper edges with notches, the side walls of said grooves being dove-tailed and gradually converging toward thedower' ends I f the legs and tapered cover plates arranged to slidably fit within said dove-tailed grooves.

v 6. A drill comprising a tool holder, a bit carrier having a bifurcated lower end, a

pair of bit blades arranged in the bifurcated end of the carrier, a pivot pin carried llllll & 1

including a reduced threaded end, said reduced threaded end forming a shoulder for engaging the inner face of the lower end of said bit carrier to limit the movement of the pin therein.

7. In a drill apparatus, a bit carrier including a cylindrical body and depending spaced legs, a bolt carried by the lower end of the legs, a pair of bit blades having slots arranged to receive the bolt, longitn- 10 din-ally extending channels formed in said legs, the channels having openings arranged to communicate with said slots to permit a certain portion of the fluid in said channels to flow in said slots.

JOHN C. STOKES. 

